Nuclear shape transition in light gold isotopes

Wallmeroth, K.; Bollen, G.; Dohn, Asmus Ougaard; Egelhof, P.; Krönert, U.; Borge, María José García; Campos, J.; Yunta, A. Rodríguez; Heyde, K.; Coster, C. De; Wood, John L.; Kluge, H.‐J.

doi:10.1016/0375-9474(89)90396-5

Cited by 87 publications

(44 citation statements)

References 60 publications

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“…Table I and Fig. 2 show the mean square charge radius variation of 184 Au g1m and other gold isotopes [3,4,35]. The value of d͗r 2 c ͘ 197,184 measured by Krönert et al [35] is consistent with ours for I 2.…”

supporting

confidence: 83%

“…Such alterations have shown alternating shape transitions and deformation changes between neighboring isotopes. This was observed in mercury [1,2], gold [3][4][5], and to a lesser degree in platinum isotopes [6,7]. Different deformations have also been observed in the states of the same nucleus.…”

mentioning

confidence: 91%

“…[3], m I A͑ 2 S 1͞2 ͒ ͑I͞29.005͒m N , and neglecting the hyperfine anomaly with respect to experimental uncertainties. The m I obtained for the isomer FIG.…”

mentioning

confidence: 99%

“…Mean square charge radius variation measured in the gold isotopes (this work and Refs. [3,4,35]). TABLE II.…”

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confidence: 99%

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Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
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Resonance ionization spectroscopy (RIS) was performed on desorbed Au, and the complete hyperfine spectrum of both isomeric and ground states of the short lived 184 Au nucleus has been recorded from the 5d 10 6s 2 S 1͞2 ! 5d 10 6p 2 P 3͞2 optical transition. The nuclear moments of both states and the mean square charge radius changes were measured. The magnetic moments were determined to be m 184g Light gold isotopes belong to a mass region where drastic changes in the nuclear charge radius have been measured by laser spectroscopy. Such alterations have shown alternating shape transitions and deformation changes between neighboring isotopes. This was observed in mercury [1,2], gold [3][4][5], and to a lesser degree in platinum isotopes [6,7]. Different deformations have also been observed in the states of the same nucleus. The best example is 185 Hg where the large radius difference measured between its ground and isomeric state [8] has shown a prolate-oblate shape coexistence which was confirmed later from g-ray spectroscopic studies [9,10].In this context, the doubly odd nucleus 184 Au with its isomeric state at 68 keV excitation energy [11,12] is particularly interesting to investigate since it is located in the middle of this transitional region [13,14]: States corresponding to prolate and oblate or triaxial shapes coexist in 183,185 Au [9,15,16] and 185 Hg, while 183 Pt is prolate in all its low energy states [17][18][19]. Several nuclear spectroscopy studies were performed on 184 Au, and it has been established that (i) a shape coexistence is excluded at low excitation energy [20], and (ii) the spin and parity are 5 1 for the ground state and 2 1 for the isomer with the following proton-neutron ͑p ≠ n͒ configurations: ph 9 2 ≠ n 7 2 ͓514͔ and ph 9 2 ≠ n 1 2 ͓521͔, respectively [21]. Furthermore, calculations using rotor 1 one-quasiparticle and rotor 1 two-quasiparticle coupling models were performed on the N 105 isotones 183 Pt, 182 Ir [22], 185 Hg, and 184 Au [23]. They show that the relative energy location of the 5 1 and 2 1 states suggests a deformation change, either between 184 Au g and 184 Au m or between 184 Au and its neighboring isotopes. Therefore, the determination of the quadrupole moment in both isomer and ground states, as well as the change in the mean square charge radius between them, is crucial to fully characterize their nuclear shape. Moreover, a measurement of the magnetic moments of the two states will allow a clear confirmation of the p ≠ n configurations. In addition, the p ≠ n coupling scheme can be defined from the quadrupole moment values.In this Letter, we present optical measurements on 184 Au. The hyperfine structure is measured providing the magnetic A and electrostatic B hyperfine constants of the levels involved in the atomic transition as well as the isomeric shift. A is related to the magnetic moment m I , and B to the spectroscopic quadrupole moment Q s . The isomeric shift, which is the displacement of the centers of gravity of the two hyperfine spectra, determines the...

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confidence: 83%

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confidence: 91%

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Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
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“…[4]) and Au (Z = 79, Ref. [52]) in which a well-known pronounced deviation from sphericity has been observed. Previously, a large isomer shift between the ground (π 3s 1/2 ) and the isomeric (intruder, π 1h 9/2 ) states in 185,191,193,195,197 Tl was found (see Ref.…”

Section: B Changes In Mean-square Charge Radiimentioning

confidence: 99%

Changes in mean-squared charge radii and magnetic moments of Tl179–184 measured by in-source laser spectroscopy

Barzakh¹,

Andreyev²,

Cocolios³

et al. 2017

Phys. Rev. C

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Hyperfine structure and isotope shifts have been measured for the ground and isomeric states in the neutrondeficient isotopes [179][180][181][182][183][184] Tl using the 276.9-nm transition. The experiment has been performed at the CERNIsotope Separator On-Line facility using the in-source resonance-ionization laser spectroscopy technique. Spins for the ground states in 179,181,183 Tl have been determined as I = 1/2. Magnetic moments and changes in the nuclear mean-square charge radii have been deduced. By applying the additivity relation for magnetic moments of the odd-odd Tl nuclei the leading configuration assignments were confirmed. A deviation of magnetic moments for isomeric states in 182,184 Tl from the trend of the heavier Tl nuclei is observed. The charge radii of the ground states of the isotopes [179][180][181][182][183][184] Tl follow the trend for isotonic (spherical) lead nuclei. The noticeable difference in charge radii for ground and isomeric states of 183,184 Tl has been observed, suggesting a larger deformation for the intruder-based 9/2 − and 10 − states compared to the ground states. An unexpected growth of the isomer shift for 183 Tl has been found.

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79-Au Gold

Fricke

Heilig

Nuclear Charge Radii

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Nuclear shape transition in light gold isotopes

Cited by 87 publications

References 60 publications

Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
46
0
19
0
View full text Add to dashboard Cite

Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
46
0
19
0
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Changes in mean-squared charge radii and magnetic moments of Tl179–184 measured by in-source laser spectroscopy

79-Au Gold

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Nuclear shape transition in light gold isotopes

Cited by 87 publications

References 60 publications

Nuclear Moments and Deformation Change inA184ug,mBlanc1, Obert2, Oms3 et al. 1997Phys. Rev. Lett.460190View full textAdd to dashboardCite

Nuclear Moments and Deformation Change inA184ug,mBlanc1, Obert2, Oms3 et al. 1997Phys. Rev. Lett.460190View full textAdd to dashboardCite

Changes in mean-squared charge radii and magnetic moments of Tl179–184 measured by in-source laser spectroscopy

79-Au Gold

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Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
46
0
19
0
View full text Add to dashboard Cite

Nuclear Moments and Deformation Change inA184ug,m
Blanc
¹
,
Obert
²
,
Oms
³

et al. 1997
Phys. Rev. Lett.
46
0
19
0
View full text Add to dashboard Cite